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  1. Tried this on the J80 emulator adding the 4th ROM...

    Tried this on the J80 emulator adding the 4th ROM from PC-8001 Mk II N80 BASIC to the PC-8001 N-BASIC, but no joy. Came up with the 'NEC N-80 BASIC Ver 1.0' welcome screen but no response from the...
  2. Hi again, just found another piece of the PC-8001...

    Hi again, just found another piece of the PC-8001 jigsaw :-) I've read the following description of N-Basic and N80-Basic:

    https://retrocomputerpeople.blog.so-net.ne.jp/2010-09-26

    "The 4th ROM...
  3. I've found the following description of Dash-80...

    I've found the following description of Dash-80 (in Japanese so open in Chrome to translate):

    https://retrocomputerpeople.blog.so-net.ne.jp/2010-10-25

    "Dash-8X started with the concept of...
  4. Some progress! Firstly I've dumped my PC-8031...

    Some progress! Firstly I've dumped my PC-8031 ROM, it is a 2316 and luckily is compatible with a 2716 EPROM. I copied the .BIN file to the J80 emulator system directory and edited the j80.cfg file to...
  5. Thanks for the quick reply. My hope is that as a...

    Thanks for the quick reply. My hope is that as a lot of D88 zip files are so small that most of the 384KB when expanded is empty, and all the data is only on one side of the floppy. Still worth...
  6. Apologies for re-openning an old thread, I've...

    Apologies for re-openning an old thread, I've just started looking at the .D88 disk image files. These all seem to be for DSDD drives. I've read here:

    https://archive.is/Hp9CS

    that the PC-8031...
  7. Thanks, I see your post got some replies - good...

    Thanks, I see your post got some replies - good luck figuring it out!

    https://www.eevblog.com/forum/vintage-computing/tektronix-4052-4054-system-test-fixture/msg2556183/

    Regards,
    John
  8. Hi, Looks like a small part of a larger...

    Hi,
    Looks like a small part of a larger automatic test equipment (ATE) set-up used in manufacturing. Have you tried asking in these forums?

    https://www.eevblog.com/forum/testgear/
    ...
  9. NEC PC-8001 N-BASIC manual (Japanese) - eBay US

    Spotted on ebay.com (I have no connection to the seller):

    https://www.ebay.com/itm/NEC-PC8001-N-BASIC-Vintage-Programming-Manual-Z80-Japanese-Computer-Platform/264355940361

    If anyone has the...
  10. NEC PC-8031 floppy power supply notes (part of PC-8001 computer)

    Hi,

    Quick summary - no issues found powers up with all the expected voltages under load.

    I have a stack of 3 PC-8001 units all with the same power supply. I have never powered these units on,...
  11. Hi, I can supply and program a range of EPROM...

    Hi,

    I can supply and program a range of EPROM chips from 2708 to 27512, and also the MCM 68764. This can be used to replace most 2364 ROMs, where chip enable (CE) is negative (eg in the IBM PC).
    ...
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    Well someone has :-) Thanks to our friends on...

    Well someone has :-)
    Thanks to our friends on the Stardot forum:

    https://stardot.org.uk/forums/viewtopic.php?f=45&p=230615

    with link to:
    https://www.thingiverse.com/thing:3135233

    Also...
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    Found the datasheets for a range of MELCARDs...

    Found the datasheets for a range of MELCARDs including my one:

    http://pdf1.alldatasheet.com/datasheet-pdf/view/1691/MITSUBISHI/MF3257-J8CATXX.html

    Some use 2025 battery and some (like mine)...
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    Thanks. I found this on:...

    Thanks. I found this on: https://web.archive.org/web/20010429053125/http://www.melcard.de:80/englisch/produkte/sram.htm


    Very low current consumption: 0.1 mA - 0.3 mA standby current / 1.4 A -...
  15. Replies
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    Mitsubishi SRAM Melcard query

    Hi,
    I've just fitted a new battery (lithium 3V, 2325 size) to my 2MB SRAM Melcard (PCMCIA card), which is working fine. Recognised by XP laptop, can format (FAT) and save and read files.

    On the...
  16. Hi, I have an Osborne 1 which I recently fixed...

    Hi,
    I have an Osborne 1 which I recently fixed up. I previously used it about 9 years ago, so before powering it up I replaced some capacitors on the power supply.

    Here's how to get to the PSU...
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    Hi, On my 380Z lock I removed it and found a...

    Hi,
    On my 380Z lock I removed it and found a spot to drill through to allow disassembly of the lock. I then took it to a locksmith who made a key for 5 (might be about 8 years ago now). However the...
  18. Wow thanks for the link, figure 4 looks to be the...

    Wow thanks for the link, figure 4 looks to be the way to go. A 230V to 18V (9V + 9V) or 24V (12V + 12V) transformer should be easily available. I would suggest mounting this in a separate box with a...
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    Link rot, here's a current link:...

    Link rot, here's a current link:
    http://ohlandl.ipv7.net/8555/8555_Planar.html

    Regards,
    John
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    Thanks, I didn't have it enabled. On my Android...

    Thanks, I didn't have it enabled. On my Android phone I have to zoom in to read the subject of each thread, and then scroll around as the text doesn't flow (like it does on a responsive web page). I...
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    Request for responsive Web design

    Hi,
    Are there any plans please to update the forum to be more mobile browser friendly? If you need funds for a vbulletin update then I for one would make a small donation :-)
    Regards,
    John
  22. London 18th Jan 2018 - Computer Conservation talk on PDP8/I replica

    From an email sent to members, non-members welcome (must book as per link), currently 47 spaces left:

    Welcome to the first meeting of 2018 of the Computer Conservation Society which is on Thursday...
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    Model 1 - RS232 Expansion board query

    Hi,

    I have a Model 1 Expansion unit with an RS232 board, as per:

    http://akhara.com/trs-80/docs/model1/RS-232-C%20(1978)(Tandy)(pdf).zip

    My board is missing the DC converter, which takes 5V...
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    Hi, Apologies if this has been covered already,...

    Hi,
    Apologies if this has been covered already, but have you set the Nascom memory wait state jumper to on? According to manual:

    http://www.nascomhomepage.com/pdf/hardman.PDF

    this is LSW1/0...
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    Hi, Thanks for uploading your documents, I...

    Hi,
    Thanks for uploading your documents, I bought one of these machines a few years ago. It runs the monitor fine but not much else, I have the job of getting the floppy drives to work on my 'to do...
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